Insulating sleeve



FIG. 1 is a top perspective view of an insulating sleeve showing my newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a bottom perspective view thereof; and,

FIG. 7 is a top perspective view thereof shown in use.

All broken lines in the drawings are for illustrative purposes only andform no part of the claimed design.

CLAIM The ornamental design for an insulating sleeve, as shown anddescribed.